What must items containing classified information be classified as?

The correct response highlights the importance of ensuring that classified information is appropriately protected. When items contain classified information, they must be classified at the highest classification level of any included information. This approach safeguards sensitive information effectively by establishing a consistent standard that protects all elements contained within a document or item.

Classifying items at the highest level is essential because it prevents potential exposure of less sensitive information that might be included in the same item. By doing this, the risk of an insider threat or unauthorized access is mitigated, as it ensures that all components are given the proper level of scrutiny and security. This rationale underpins various classification guidelines and policies, which aim to protect national security and sensitive operations.

In contrast, options that suggest lower classification levels or discretion fail to recognize the inherent risks associated with mixing various classifications. They may lead to inadequate protection, increasing the potential for sensitive information to be disclosed or mismanaged. Thus, classifying items correctly with regard to their contents is crucial for maintaining operational security and safeguarding sensitive information.